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Diffstat (limited to 'fs/gfs2/glock.h')
-rw-r--r--fs/gfs2/glock.h36
1 files changed, 36 insertions, 0 deletions
diff --git a/fs/gfs2/glock.h b/fs/gfs2/glock.h
index 9ad4a6ac6c84..5e12220cc0c2 100644
--- a/fs/gfs2/glock.h
+++ b/fs/gfs2/glock.h
@@ -13,6 +13,7 @@
#include <linux/sched.h>
#include <linux/parser.h>
#include "incore.h"
+#include "util.h"
/* Options for hostdata parser */
@@ -181,7 +182,9 @@ static inline struct address_space *gfs2_glock2aspace(struct gfs2_glock *gl)
extern int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
const struct gfs2_glock_operations *glops,
int create, struct gfs2_glock **glp);
+extern void gfs2_glock_hold(struct gfs2_glock *gl);
extern void gfs2_glock_put(struct gfs2_glock *gl);
+extern void gfs2_glock_queue_put(struct gfs2_glock *gl);
extern void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state,
u16 flags, struct gfs2_holder *gh);
extern void gfs2_holder_reinit(unsigned int state, u16 flags,
@@ -257,11 +260,44 @@ static inline bool gfs2_holder_initialized(struct gfs2_holder *gh)
return gh->gh_gl;
}
+/**
+ * glock_set_object - set the gl_object field of a glock
+ * @gl: the glock
+ * @object: the object
+ */
static inline void glock_set_object(struct gfs2_glock *gl, void *object)
{
spin_lock(&gl->gl_lockref.lock);
+ if (gfs2_assert_warn(gl->gl_name.ln_sbd, gl->gl_object == NULL))
+ gfs2_dump_glock(NULL, gl);
gl->gl_object = object;
spin_unlock(&gl->gl_lockref.lock);
}
+/**
+ * glock_clear_object - clear the gl_object field of a glock
+ * @gl: the glock
+ * @object: the object
+ *
+ * I'd love to similarly add this:
+ * else if (gfs2_assert_warn(gl->gl_sbd, gl->gl_object == object))
+ * gfs2_dump_glock(NULL, gl);
+ * Unfortunately, that's not possible because as soon as gfs2_delete_inode
+ * frees the block in the rgrp, another process can reassign it for an I_NEW
+ * inode in gfs2_create_inode because that calls new_inode, not gfs2_iget.
+ * That means gfs2_delete_inode may subsequently try to call this function
+ * for a glock that's already pointing to a brand new inode. If we clear the
+ * new inode's gl_object, we'll introduce metadata corruption. Function
+ * gfs2_delete_inode calls clear_inode which calls gfs2_clear_inode which also
+ * tries to clear gl_object, so it's more than just gfs2_delete_inode.
+ *
+ */
+static inline void glock_clear_object(struct gfs2_glock *gl, void *object)
+{
+ spin_lock(&gl->gl_lockref.lock);
+ if (gl->gl_object == object)
+ gl->gl_object = NULL;
+ spin_unlock(&gl->gl_lockref.lock);
+}
+
#endif /* __GLOCK_DOT_H__ */